
Birthday Girl
4.3 stars from 117,200 reviews. One of the highest rated Contemporary Fiction books we track.
Last checked: Apr 5, 2026
Must ReadHighly rated with thousands of reviews. A proven favourite.Full price — consider adding to your watchlist for a better deal.
Price range: Free – $4.99
0 readers are tracking this book's price
Fans of these authors will like this...
- Colleen Hoover
- Elsie Silver
- Regrette Éternelle
Fans of these books will like this...
- It Ends with Us
- Reminders of Him
- Credence
Perfect for you if...
- You enjoy forbidden romance with a significant age gap and the tension of rules that shouldn't be broken.
- You love Penelope Douglas's character-driven storytelling and the slow burn of attraction between complex, flawed people.
- You want a contemporary romance that doesn't shy away from messy family dynamics and moral grey areas.
Maybe not for you if...
- You're uncomfortable with age-gap relationships or large power imbalances between romantic leads.
- You prefer romance where the couple is free to pursue each other without external obstacles or ethical complications.
- You're looking for a light, feel-good romance without dark themes or complicated family entanglements.
About this book
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Price History
Kindle price over time. Green zones = periods when the book was free.
Price has dropped 9 times over the last 5 years. Goes on sale roughly every 179 days. Typically stays discounted for 3 days.
Sales Rank
Amazon sales rank: lower number = better selling book. #1 is the bestseller.
Currently #570 in the Kindle store — a top-1,000 bestseller.
Rating & Reviews
Purple line = star rating over time. Blue area = total review count growth.
Currently 4.3★ from 117,200 reviews
Gaining approximately 2,052 new reviews per month. Reader interest is surging. Rating has dipped slightly from 4.4 to 4.3.
Sale Prediction
Actual Predicted
Based on past patterns, a price drop could happen soon. It typically goes on sale every 179 days and the last drop was 260 days ago. It has gone completely free in the past.
Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.
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